Thread-laying mechanism for sewing-machines.



PATENTED DEC. 3, 1907/ V 0. PEDERS'EN. I THREAD LAYING MECHANISM FOR SEWING MACHINES.

APPLIOATION IILBD EAR. 7, 1907.

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No. 872,744:. PATENTED DEG. s, 1907.

0. PEDERSEN. v THREAD LAYING MECHANISM FOR SEWING MACHINES;

APPLICATION FILED MAE. 7, 1907.

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Witnesses V lnvenhovza m Chvisman Pedemsen Ewe e s t s? Militant filedzllarch meow snmmeuhst- J i- J;-

'To all whom it may concern: 1 v Be it that I, ,Onn srrmn Pnnnnsnn', ,oitizenf of-the United, States, residing at St.

Louis, Missourighaveiinvented a certain new 5,endusefril.- Improvement in Thread-Layin a, LMechanism for. Sewing-Maohines,:.of whic thesfollewing-is;a;full,- oiear, and exact derrseription sueh as will enable others skilled in ;the to it appertains -,tomake I. and

1o ,;;use theisame neference being had to the ac*- oompanying@drawings, forming part ofthis frspeerfioation;in-whiehe.

Figured is a side elevation partly in seetion ofya sewing machine provided-'with a 1 L thread laying @meohanism embodying the 5: ifeatures of my invention; Fig; 2 is a top plan yiew: -showing the; thread-laying mechanism and; takefiig-1 on,v a .line i. just below the work ;;tahle-,;=Q andj Ei'gisi .3! to 6 inclusive are detail- ;;views; 'llustrating thevarious ,positions ewh ohaahe'- threadaearrying member and its.

ndoperatingmember oceupy in the operation oflayihgthethresdinthebarb of the needle. 7

This inventio1r.relates,.to sewi machines particularlyto that type .wlnch'employ barbed ILfl6 16,;isuol1i for example, as the -sewing;imachines zthati are used in the manu feature of boots andgshoes. 1 v 1 15.101113 object of my invention is-to provide!- a \thread layin' =meehanism' of simple construe? e tienrthatwilfifio t to y the thread in the bSJEb-Qf the needle at each operation of the machine. I I .i i-.,-- ,-.A bt;he1; hjeot of my invention is; to pro-i ,vide a thread laying mechanism that will perftztlleflrndenthrehd, to extend in a straight fro n' b e wor xtoz the takefupduring the operation ofsetting thestitchiv a ,I heae fflie'freini f illustrated my improved thread-laying mechanism in oombination with a sewing machine thatis provided with a curved barbedrneedlerthaaa ses downwardly through the work. to engage the underneath thread and then moves upwardly to pull said underneath thread up through the work. It should be understood, however, that thethread-laying mechanism herein shown is notvv limited in its use to this particular type of machine as it could be used with anyv machine provided with a barbed needle.

" Referring to the drawings which represent the preferred form of my invention, 1 desig-v nates a curved needle that is adapted to pass 5-5 downwardly through the work to permit the I the under thread 2 passing. through said er forated head. Anut 8 that isrthreade "on shown in dotted lines in these .fi

- needle, as hereinafter. more fully deseribed.

provided with a roll 16' that travels in acam under thread 2 to -be placed in thehalfbcor-f hook 3 thereon, the'maohine-being' noirided with suitable mechanism,-not' showmfeaae tuating said needle.

My 1 -.iniproved thread-laying. $0. consists of a thread-carrying rhemberf'fithrough which the under thread 2pa sse s' and a member Bthat not) ratesthereiv'vithin the, ofirerationoflaying t e-thrfead in the :barhof t e needle. The .threadicarrying member, as shown in;Fig.1,Sis provided with ashank v 4 which extends through the sleeve '5 of a I 'pinionorgear 6 and with a perforatedfihead '7 arranged out of alinem'ent withsaid shank,

the lower end of the shankaseeurelyelampsf said member to the sleeve of th e pinion 6 so; that whenever the pinion-" isv moved the thread-carrying memberA wilhmove there- 78 with, The sleeve of the pinion fi-is' jour-fg naled in a stationary support :Q-Mnderneath the work-table .110; said sleevebeingalranged islightl'yrtofone side of the path.of:movement of the needle 1, asshown 1n 3,14and 5; the shank 4 thethread-carrying member which extends through" "said sleeve being res. As the vperforated head 7: "ofthe tlnread earryinr memberis located at one side of the ates 8 axis ofsaidmember," said head .travei in' a circular path around the needle when-it is in its lowermost position, as shown and'thus iay the-thread in'the barb of= thex The means for actuating' -the threadwazir ving member A consists of a leveri 1 pivotaiijt'eone; inected td'theun'derneath side oi the support and 'provided at its, outer end-with, a rack. Q 1 segment 12 that; cooperateswiththe -pi'-nfion. as 6,-'-the;inner, end of'saldzl'evenhavinga heir t3; connected theretozwhichxis-securedithztheaups er end 0f a rocker-m 14. This rejok'arm is lhlcrumed in a stationary support 15 andfis oove 17 formed in the periphery of a eam' lock 18 on the main shaft 19 of the machine. i

The member B that cooperates with the thread-carrying member is pivoted atc20 to the underneath side of the'work-tahle 10, and is provided with a hook or finger 21, as shown in Figs. 2 to 6, inclusive,:sa1d member also having an elongated slot 22 ,'that receives a pin 23 at the outer end of a reciprocating bar a '24. The bar 24 is mounted in a guideway 25 .of.1novement of'the hook on the member B.

on the frame of thelmachine and the rear end of said bar is pivotally connected to the upper end of a rock arm 26 provided with aroll 27 that travels'in-a cam roove 28 formed in the side face of the cam b ock 1 8. 3'sliows the threadbarrying member A and the member B that cooperates therewith at rest in the, positions they after the needle 1 has passed thro work and has reached the of its downward movement, as shown in Fig. 1. The

thread-carrying member first moves from the position shown in full lines in Fig. 3 to the position shown in broken linesin said figure so as to carry the. under thread into the path :lhe member B then moves into the position shown in Fig. 4 and in so doing engages that portion of the thread which extends between the underneath side of: the stockafid 1 the head 7 of the thread-carrying member, the

movement of the member B operating to draw some of theiunder-thread from the spool or source of s'upply. The member B remains in the position to which it has beenmoved and the threadecarrying member then rotates in the reverse direction to that in which it previously mo'ved, thereby. carrying the portion of-therthread arranged on the underneath .side of. the hook or finger 21 around the shank ofytheneedle; and into the position shown in Fig; 5; The-needle then moves upwardly through the work, its barb "engaging-the thread, and the member B requickly to its original position shown 3, the threadecarrying member also starting to return to its original position but coming to rest whenthe perforation in its head 7 is in alinement with the o ening that the needle formed in the work. e threadmember remains in this position as shown in Fig. 6, while the take-up 30 is open 4 sting-to set. I the stitch and as the guide the-perforation through which i:ihe thread passes; namely,

the needle llole in the work, the thread will-extend in a stra' ht line from the work the roll 31 on the ta e-up, thereby enablin' the take-up to exert a direct downward pu I 'onithe thread in'a straight line and, thus not set the thread to any undue strain. Afiiestitch has been set the thread-carry:

uigt tt" the head 7, is in'alineme'nt- 5 member A returns to its normal position,

as shown in 3, the member B having returned to its normal postion, as previously described. I g p t I- will not describe the exact form of the cam grooves which impart movement to the rock arms 14 and 26 as it will, of course, be understood that these cams are so laid out that the members A and B will move in the manner previously described.

. Having thus described mymvention, what I claim as new and desire to secure by Letters Patent is: l

1. In a thread-laying mechanism for sewing machines, a rotatable thread-carrying member having a pinion secured thereto, a

lever having a toothed segment meshing with said pinion, a positively actuated rock arm,

a link connecting. said rockarm and lever together, an oscillating thread-engaging memher having an elongated slot formed therein,

a :reciprocating bar provided with a pin which enters said slot, and apositively actuated rock arm connected to therear end of said reciprocating bar; substantially as described,

2. In a thread-laying mechanism for sewing machines, a work support, an oscillating,

thread engaging member located 4 beneath said support-and having a laterally projecting finger, a rotatable thread-laying member arranged underneath the "thread-engaging ember and consisting of a shank having a head provided with a thread-receiving opening located at one side of said shank, means for rotating said thread-laying member first in one direction tocarry the thread into the path of movement of the laterally projecting finger of theythread=engaging member and thereafter in a reverse direction to cause it to travel around the needle, and means for actuatin the thread-engaging -member to cause it to hold the thread while the .thread-' 

